Tau and Guard represent the 2 shootiest armies in the game and fighting between the 2 tends to move towards firefights as opposed to brutal assaults. Plenty of armour on both sides also brings maneouvers into it too. Assaults are very rare and often it is just to storm a position to shoft the enemy, not fightings for fightings sake.

Is this the best way to play 40k? Often the game gets accused of being more of an assault fest than a shooting match (which is how modern warfare works)

I must confess my own battles of my Tau vs Guard have been very enjoyable for the aforementioned reasons.